This Bathroom
Glass effect applies modesty saving distortion to you photographs, as
you can see by the image below:

You can choose
from 3 sorts of glass, vertical, horizontal and square (as shown in the
image above) and in the dialog screenshot below:

.

Changing the "feature
size" changes how much the underlying image is distorted. The above
image shows just how easy the program is to use, just seclect the sort
of distortion and the size of the distortion then click on OK.

In general the
larger the feature size the more difficult it is to understand what the
original photo was: